A leaky faucet

Ok so I have this little problem with my boyfriend. I really enjoy having unprotected sex with him, please spare me the lecture on using protection, it feels great and I trust him. Anyway, after he cums inside of me I’ll go to try and get it out but the thing is I can never get all of it out. This has led to some pretty shitty (ha) problems. I’ll be at work and then bam some cum leaks out of my ass or I’ll fart and boom more cum. It SUCKS and I don’t know what to do. Should I douche afterwards, should I keep trying to push it out? Gays have been fucking since the dawn of time so I know there has to be a solution.